linux-kernel - Re: [PATCH RFC] ext4: use __GFP_NOFAIL in ext4_free

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Message-ID: <20160313213006.GG29218@thunk.org>
Date:	Sun, 13 Mar 2016 17:30:06 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Konstantin Khlebnikov <khlebnikov@...dex-team.ru>
Cc:	Michal Hocko <mhocko@...e.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Dmitry Monakhov <dmonakhov@...tuozzo.com>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH RFC] ext4: use __GFP_NOFAIL in ext4_free_blocks()

On Wed, Feb 24, 2016 at 08:09:12PM +0300, Konstantin Khlebnikov wrote:
> This might be unexpected but pages allocated for sbi->s_buddy_cache are
> charged to current memory cgroup. So, GFP_NOFS allocation could fail if
> current task has been killed by OOM or if current memory cgroup has no
> free memory left. Block allocator cannot handle such failures here yet.
> 
> Signed-off-by: Konstantin Khlebnikov <khlebnikov@...dex-team.ru>

Thanks, applied.

					- Ted